feat(thumbnails): Enhance DICOM Thumbnail Rendering with different strategies (#5004)

Co-authored-by: Martin Bellehumeur, M. Eng. <23396581+mbellehumeur@users.noreply.github.com>

platform/ui-next/src/components/Thumbnail/Thumbnail.tsx

@@ -67,12 +67,12 @@ const Thumbnail = ({
         )}
       >
         <div className="h-[114px] w-[128px]">
-          <div className="relative">
+          <div className="relative bg-black">
             {imageSrc ? (
               <img
                 src={imageSrc}
                 alt={imageAltText}
-                className="h-[114px] w-[128px] rounded"
+                className="h-[114px] w-[128px] rounded object-contain"
                 crossOrigin="anonymous"
               />
             ) : (